Guide to Blue Agate Jewellery: Background, Therapeutic Benefits, and Upkeep A blue tone can be accomplished by coloring various kinds of agates with iron shade. Confidence, quietness, profundity, recuperating, and strength are key to the importance of Blue Agate Benefits. This gem healer is a strong relic, fit for banishing hurtful spirits and changing negative energy into helpful ones. Despite the fact that agate is the birthstone related to the indication of Gemini, it isn't regularly connected with a specific birth month.